OEM Carrier Pressure Switch HK02ZB044 — 7#OPN / 22#CLS 24V for Model PY1REA150224ADWB

This is the factory OEM replacement pressure switch (part number HK02ZB044) for the Carrier PY1REA150224ADWB packaged unit. The pressure switch monitors the negative pressure created by the inducer draft motor to confirm proper venting before the ignition sequence is allowed to proceed. When this switch fails or sticks open, the control board cannot verify inducer operation and the system locks out — resulting in a no-heat condition with a pressure switch fault code. A failing switch may also cause intermittent heating cycles, nuisance lockouts, or prevent the furnace from advancing past the inducer pre-purge stage.

• Specs: Opens at 7" W.C. | Closes at 22" W.C. | 50" lead wires | 24V coil voltage | Single-port diaphragm-style switch | Country of Origin: Mexico
• OEM vs Generic: This is a genuine Carrier OEM part meeting exact factory design specifications for tolerance and diaphragm life testing. Generic aftermarket switches frequently carry wider W.C. tolerances that can cause nuisance trips or fail to protect the heat exchanger under marginal draft conditions.
• Install Difficulty: 2/5 — Straightforward swap with no refrigerant handling required. Turn off power at the disconnect before servicing. Tools needed: 1/4" nut driver, needle-nose pliers. Inspect the pressure tubing and port for cracks or blockages before installing the new switch — a clogged port is a common root cause of switch failure.
• Warranty: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as a drop-in replacement for Carrier model PY1REA150224ADWB. Always verify the W.C. rating stamped on your original switch against these specs before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.